The land depression over south Madhya Pradesh moved west-northwestwards and is likely to weaken gradually, said the weather department on Monday.
At 6am today, it was lying over south Madhya Pradesh and adjoining area of India and is likely to move west-northwestwards further, the Met office said in a special bulletin.
Under its influence, deep convection is also taking place over north Bay and adjoining area.
Read: Depression: Tidal surges likely to inundate low-lying areas of coastal districts
Squally weather may affect the maritime ports, north Bay and adjoining coastal areas of Bangladesh.
Maritime ports of Chattogram, Cox’s Bazar, Mongla and Payra have been advised to keep hoisted local cautionary signal No 3.
"All fishing boats and trawlers in the North Bay have been advised to remain close to the coast and proceed with caution until further notice," the department said.
They are also advised not to venture into the deep sea, it added.
Read: Maritime ports told to warn vessels of 'deep depression' in Bay
Meanwhile, Low-lying areas of coastal districts and their offshore islands and chars are likely to be inundated by tidal surges.
These districts are Satkhira, Khulna, Bagerhat, Jahalakathi, Pirojpur, Barguna, Patuakhali, Bhola, Barishal, Laxmipur, Chandpur, Noakhali, Feni, Chattogram and Cox’s Bazar.